I would use the same fabric (a tleast the focus fabric) and make them different, or the same and change the placement of the fabrics. I do that for my daughter's kids. They have two sets of bunk beds, one the in girls room and one in the boys room. Once I made them both I Spy quilts but used different border/backing fabric. They came out adorable. The reason I suggest using the same fabrics is that they will look coordinated in your room. Have fun making them.